Preheat a large non stick skillet over medium high heat.,Add olives, mushrooms and sundried tomatoes to the pan. Saute these ingredients until the majority of the oil and liquid is absorbed by the mushrooms.,Add spinach to the skillet and saute briefly until the spinach has wilted.,______,Turn heat off. Add feta cheese and gently stir. Most will be melted but there will be some soft larger chunks.,Serve with sour cream and/or salsa if desired.